| /* Error-checking wrapper for sysconf. |
| Copyright (C) 2017-2018 Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| |
| The GNU C Library is free software; you can redistribute it and/or |
| modify it under the terms of the GNU Lesser General Public |
| License as published by the Free Software Foundation; either |
| version 2.1 of the License, or (at your option) any later version. |
| |
| The GNU C Library is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public |
| License along with the GNU C Library; if not, see |
| <http://www.gnu.org/licenses/>. */ |
| |
| #include <errno.h> |
| #include <support/check.h> |
| #include <support/xunistd.h> |
| |
| long |
| xsysconf (int name) |
| { |
| /* Detect errors by a changed errno value, in case -1 is a valid |
| value. Make sure that the caller does not see the zero value for |
| errno. */ |
| int old_errno = errno; |
| errno = 0; |
| long result = sysconf (name); |
| if (errno != 0) |
| FAIL_EXIT1 ("sysconf (%d): %m", name); |
| errno = old_errno; |
| return result; |
| } |